" The world is a wonderfully weird place, consensual reality is significantly flawed, no institution can be trusted, certainty is a mirage, security a delusion, and the tyranny of the dull mind forever threatens -- but our lives are not as limited as we think they are, all things are possible, laughter is holier than piety, freedom is sweeter than fame, and in the end it's love and love alone that really matters."

Very generally speaking, there are fair use rights for all electronic images accept in the case of images that contain the copyright or trademark symbol.

The subject of copyright on images have to be policed by the owner so the best they can do is to mark electronic images they release. Otherwise they have to find the image and demand its removal as there is really no way to fully protect an unmarked image. Sharing of images via email, private message boards or on peer-to-peer networks are practically impossible to police.

The full copyright law can be found both on the Wikipedia and the Copyright Office's website: